Optoelectronic Image Sensor Projective Transformation Perspective Correction
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Solution Overview
Problem
Image recording devices with optoelectronic sensors often suffer from perspective distortions when the image sensor is tilted relative to the scene, leading to cropped and unusable image regions during correction, which can result in important compositional elements being lost.
Innovation Solution
An image recording device equipped with an optoelectronic image sensor, a position sensor, and an evaluation unit that detects the sensor's spatial position and applies a projective transformation to correct perspective distortions, ensuring all relevant image regions are captured and displayed to the user during recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If perspective distortion correction is applied through inverse transformation, then straight lines are corrected to be parallel, but the margins become distorted and image regions are cropped
Solution Approach 1:
The patent applies projective transformation during the image recording process itself, rather than as a post-processing step. The evaluation unit calculates the projective transformation based on detected spatial position data and applies it to map the image data set onto a projection plane, ensuring that the transformation is performed before final image generation and display, thus preventing margin distortion and preserving the complete image area.
2Area of stationary object
If the image sensor is tilted to capture a broader scene, then more image regions are included, but perspective distortion increases
Solution Approach 1:
The patent dynamically changes the transformation parameters based on the detected spatial position of the image sensor. The evaluation unit determines a projective transformation that depends on both the rotation angle and tilt angle detected by the position sensor. This allows the system to adapt the correction parameters to the actual sensor orientation, maintaining perspective accuracy regardless of the tilt angle used to capture broader scene coverage.
3Manufacturing precision
If post-processing correction is applied to recorded image data, then perspective distortion is corrected, but important compositional elements are lost due to cropping
Solution Approach 1:
The patent performs the projective transformation during the image recording process itself, mapping the image data set onto a projection plane before the image is finalized. This preliminary application of the transformation ensures that all image regions, including those at the margins, are properly transformed and preserved, preventing the loss of compositional elements that would occur with post-processing correction and cropping.
Data Source
AI summary
Disclosed is an image recording device, wherein the image sensor acquires an image data set onto an image area of the image sensor. The position sensor detects a spatial position of the image area relative to a reference direction and provides position data that specify both an angle of rotation and a tilt angle of the image sensor. The evaluation unit determines, from the position data, a projective transformation that maps the image data set onto a projection plane, which is tilted with respect to the image area, in dependence on both the rotation and the tilt. The evaluation unit determines an image section in the projection plane for the image data set mapped onto the projection plane by a projective transformation and displays the image section with at least a region of the imaged scene that lies within the image section in the graphical user output interface.